Blessed or Cursed? || KNY+oc ¤ Angel!Reader !Heavy Editing!

you have a best friend named Muzan, he almost dies when he was borned. You guys often play with each other and chatting. But one day, the both of you fell into the disease. Muzan was impatient and angry that medicine has work on him or his best friend. He killed the doctor before taking the second semester medicine. A...